TITLE: GCN CIRCULAR NUMBER: 33194 SUBJECT: GRB 230116D: Swift-BAT refined analysis DATE: 23/01/18 22:24:27 GMT FROM: Sibasish Laha at GSFC C. B. Markwardt (GSFC),S. D. Barthelmy (GSFC), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa), D. M. Palmer (LANL), T. Parsotan (GSFC/UMBC),T. Sakamoto (AGU), M. Stamatikos (OSU) (i.e. the Swift-BAT team): Using the data set from T-240 to T+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 230116D (trigger #1149293) (Sonbas et al., GCN Circ. 33176). The BAT ground-calculated position is RA, Dec = 98.584, 49.831 deg which is RA(J2000) = 06h 34m 20.1s Dec(J2000) = +49d 49' 50.3" with an uncertainty of 2.9 arcmin, (radius, sys+stat, 90% containment). The partial coding was 98%. The BAT light curve showed a complex structure with a duration of about 40 sec. T90 (15-350 keV) is 41.00 +- 11.18 sec (estimated error including systematics). The time-averaged spectrum from T+1.14 to T+53.144 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.38 +- 0.22. The fluence in the 15-150 keV band is 8.12 +- 1.2 x 10^-07 erg/cm2. The 1-sec peak photon flux measured from T+12.14 sec in the 15-150 keV band is 0.6 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/1149293/BA/